WO2020064250A1 - Gestion de redirection de tranches de réseau - Google Patents

Gestion de redirection de tranches de réseau Download PDF

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Publication number
WO2020064250A1
WO2020064250A1 PCT/EP2019/072935 EP2019072935W WO2020064250A1 WO 2020064250 A1 WO2020064250 A1 WO 2020064250A1 EP 2019072935 W EP2019072935 W EP 2019072935W WO 2020064250 A1 WO2020064250 A1 WO 2020064250A1
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WO
WIPO (PCT)
Prior art keywords
network
network slice
slice
communication
network communication
Prior art date
Application number
PCT/EP2019/072935
Other languages
English (en)
Inventor
Andrew CORSTON-PETRIE
Ruth Brown
Jonathan Hart
Original Assignee
British Telecommunications Public Limited Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Telecommunications Public Limited Company filed Critical British Telecommunications Public Limited Company
Priority to EP19758746.2A priority Critical patent/EP3857978B1/fr
Priority to CN201980063101.4A priority patent/CN112771931B/zh
Priority to US17/280,312 priority patent/US20220038953A1/en
Publication of WO2020064250A1 publication Critical patent/WO2020064250A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/088—Load balancing or load distribution among core entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/09—Management thereof
    • H04W28/0958—Management thereof based on metrics or performance parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events

Definitions

  • the present invention relates to a method of, and to a telecommunications network for, managing network traffic, and in particular to managing traffic amongst network slices of the telecommunications network.
  • Network slicing is a method of virtualising a network so as to create multiple logical networks within a single physical network. This is typically undertaken to offer differentiated service models, which might include varying performance and/or stability characteristics within a network, and it is supported by the fact that network slices are isolated from one another other during operation. As a result, high traffic or a large number of users on one slice is unable negatively to affect other network slices.
  • network slices may be configured to provide specialised functions, including: exclusively serving emergency services (which demands, at least, reliability); enhanced Mobile Broadband (eMBB); and Massive Machine Type Communications (MMTC).
  • emergency services which demands, at least, reliability
  • eMBB enhanced Mobile Broadband
  • MMTC Massive Machine Type Communications
  • a network will adapt network slices to suit network conditions and to optimise utilisation of individual network slices. To ensure constant availability of resources as network slices’ resources are consumed, scaling occurs. If a network slice reaches a threshold utilisation the creation of additional slice resources may be triggered so as to cope with high network loads; this is typically achieved by‘scaling up’ or by‘scaling out’ a network slice.
  • the allocation of new processing resources to a network slice can take a matter of minutes, and typically around 2 to 10 minutes. However, during such scaling new users may be prevented from joining the slice or potential network congestion may be experienced by users.
  • a method of managing network traffic in a telecommunications network the telecommunications network having a plurality of network slices and a User Equipment (UE), wherein the UE is - optionally, initially - allocated to a first network slice for processing a network communication from the UE, the method comprising the steps of: monitoring a suitability of the first network slice to process the network communication; identifying a second network slice that is suitable for processing the network communication; and in response to identifying a lack of suitability of the first network slice to process the network communication, redirecting the network communication to the second network slice whilst the UE remains allocated to (or registered with) the first network slice.
  • the telecommunications network has a plurality of UEs. In this way, processing resources of the second network slice may be utilised to assist with processing the network communication, which might otherwise not be able to be processed as effectively by the first network slice.
  • the term“is suitable” in reference to identifying the second network slice for processing the network communication preferably connotes a network slice that is currently suitable or is expected to become suitable.
  • the term“allocated” with reference to the allocation of the UE to the first network slice preferably connotes: the identification or selection of the first network slice as a suitable network slice with which to register the UE, but where the UE has not yet - but is to be - registered with the first network slice; where the UE is registering with the first network slice; and/or where the UE is already registered with the first network slice.
  • the network communication is: a data packet; a part thereof; a plurality of data packets; and/or a data session.
  • the network communication may be an attach request or may follow an attach request.
  • the network communication is redirected to the second network slice before being received by the first network slice, and more preferably, before any part of the network communication is received and/or processed by the first network slice or before all of the network communication is received and/or processed by the first network slice.
  • the method further comprises the steps of identifying the second network slice in response to identifying a lack of suitability of the first network slice.
  • the first (and/or second) network slice is suitable to process the network communication if the first (and/or second) network slice has, or will have, sufficient excess available processing resources to process the network communication.
  • the method may therefore further comprise the step of determining the processing resources available on the first and/or second network slice/s.
  • the first (and/or second) network slice is suitable to process the network communication if the first (and/or second) network slice has, or will have, a number of concurrent users that is below a threshold.
  • the method may therefore further comprise the step of determining the number of concurrent users on the first and/or second network slice/s.
  • the first (and/or second) network slice is suitable to process the network communication if the first (and/or second) network slice has a network performance that is, or will be, beyond (or above) a threshold.
  • the method may therefore further comprise the step of determining the network performance of the first and/or second network slice/s.
  • the network performance may be determined by measuring: latency, jitter, bandwidth, packet error rate and/or Round-Trip Time (RTT).
  • RTT Round-Trip Time
  • the network performance threshold may be dependent on the type of network communication.
  • the first (and/or second) network slice is suitable to process the network communication if an absence of any ongoing and/or future reconfiguration associated with the first (and/or second) network slice is identified.
  • the method may therefore further comprise the step of identifying ongoing and/or (scheduled) future reconfiguration of the first and/or second network slice/s.
  • the reconfiguration is a: re-starting; scaling (up, down and/or out); closing; and/or opening of the first network slice.
  • identifying the first (and/or second) network slice as being unsuitable to process the network communication triggers the first network slice to reconfigure.
  • identifying the second network slice is performed in response to identifying the first network slice as being unsuitable.
  • the network communication would cause, if processed by the first network slice, or does cause, the first network slice to become unsuitable for processing the network communication.
  • the registration of the UE to the first network slice would cause the first network slice to become unsuitable for processing the network communication.
  • the network communication may cause re-configuration of the first network slice.
  • the first and the second network slices remain (optionally, continuously) operational during, at least, the steps of monitoring, identifying and redirecting.
  • the network communication is redirected to at least one function, but not to all functions, of the second network slice.
  • function/s of first network slice that correspond to those of the second network slice to which the network communication is/are redirected are bypassed in first network slice.
  • the network communication is redirected only to one function of the second network slice.
  • the network communication is redirected to a User Plane Function (UPF) of the second network slice.
  • UPF User Plane Function
  • the method further comprises the steps of: continuing to monitor the suitability of the first network slice to process the network communication after redirecting the network communication to the second network slice; and in response to identifying that the first network slice is suitable to process the network communication, ceasing to redirect the network communication to the second network slice (thereby to allow the first network slice to process the network communication).
  • the second network slice has substantially the same configuration and/or network performance as the first network slice, when the first network slice is suitable for processing the network communication.
  • the second network slice may therefore be configured for the same purpose as the first network slice, wherein the purposes may be a specialised function, such as eMBB, emergency services communications, Ultra Reliable, Low Latency Communications (URLLCs), etc.
  • the second network slice is a network slice that has the closest matching configuration and/or network performance to that of the first network slice.
  • the second network slice is identified in dependence on the amount of excess processing resources available and similarity of configuration to the first network slice.
  • the second network slice is configured to process the network communication in a manner that is no worse than the first network slice, when the first network slice is suitable for processing the network communication. More preferably, this is when: network efficiency (cost, or other resource); network performance; Quality of Service; and/or Quality of Experience associated with processing the network communication are no worse.
  • the first network slice is a network slice that is most preferred by the telecommunications network for processing the network communication, when the first network slice is suitable for handling said network communication.
  • the first network slice is a network slice that is preferred over the second network slice by the telecommunications network for processing the network communication, when the first network slice is suitable for handling said network communication.
  • Preference of a network slice by the network may be dependent on: network efficiency (cost, or other resource); network performance metrics; Quality of Service; and/or Quality of Experience.
  • identifying the second network slice further comprises the steps of: measuring network performance of the second network slice; and assessing whether the network performance surpasses a threshold.
  • the second network slice may be preselected.
  • a single given network slice of the telecommunications network may be (simultaneously or sequentially) the first network slice in a first iteration of the method and the second network slice in a second iteration of the method.
  • a network communication may therefore be redirected to a single network slice from another network slice and, simultaneously, another network communication may be redirected from said single network slice to yet another network slice.
  • redirecting the network communication to the second network slice is implemented in a core of the telecommunications network, and more preferably, only in the core.
  • the network communication has yet to be received by a core of the telecommunications network.
  • the telecommunications network may be a mobile cellular network and/or a fixed-line network.
  • a telecommunications network for managing network traffic, the telecommunications network comprising: a first network slice and a second network slice (provided, for example, by a processor), and the UE being - optionally, initially - allocated to the first network slice for processing a network communication from the UE; a processor for monitoring a suitability of the first network slice to process the network communication and for identifying a second network slice that is suitable for processing the network communication; and a controller for redirecting the network communication to the second network slice, whilst the UE remains allocated to (or registered with) the first network slice, in response to identifying a lack of suitability of the first network slice to process the network communication.
  • the processor and the controller are arranged in a core of the telecommunications network.
  • a computer-readable storage medium comprising instructions that, when executed by a processor associated with a telecommunications network, causes the telecommunication network to perform the aforesaid method.
  • the invention extends to any novel aspects or features described and/or illustrated herein.
  • the invention extends to methods and/or apparatus substantially as herein described and/or as illustrated with reference to the accompanying drawings.
  • the invention also provides a computer program and a computer program product for carrying out any of the methods described herein and/or for embodying any of the apparatus features described herein, and a computer readable medium having stored thereon a program for carrying out any of the methods described herein and/or for embodying any of the apparatus features described herein.
  • the invention also provides a signal embodying a computer program for carrying out any of the methods described herein and/or for embodying any of the apparatus features described herein, a method of transmitting such a signal, and a computer product having an operating system which supports a computer program for carrying out any of the methods described herein and/or for embodying any of the apparatus features described herein.
  • any apparatus feature described herein may be provided, additionally or alternatively, as a feature of a method/process, and vice versa.
  • features that are recited in the form of means plus function may, additionally or alternatively, be defined according to their corresponding structure, such as a suitably programmed processing unit.
  • any feature in one aspect of the invention may be applied to other aspects of the invention, in any appropriate combination.
  • method aspects may be applied to apparatus aspects, and vice versa.
  • any, some and/or all features in one aspect can be applied to any, some and/or all features in any other aspect, in any appropriate combination. It should also be appreciated that particular combinations of the various features described and defined in any aspects of the invention can be implemented and/or supplied and/or used independently.
  • Figure 1 shows a schematic diagram of an exemplary telecommunications network
  • Figure 2 shows a portion of the network
  • FIGS 3, 4 and 5 outline processes for managing network slices within the network. Specific Description
  • Figure 1 is a schematic diagram of an exemplary telecommunications network 100.
  • the network 100 is shown as a mobile cellular network comprising User Equipment (UE) 1 10 (e.g . in the form of a mobile cellular device, laptop or tablet) that is configured to utilise the telecommunications network 100 by accessing a Radio Access Network (RAN) 1 15, as provided by RAN access points 120 (e.g. in the form of a macro-, micro-, pico- or femto-cell site).
  • UE User Equipment
  • RAN access points 120 e.g. in the form of a macro-, micro-, pico- or femto-cell site.
  • the RAN access points 120 are connected to a core network 125.
  • the network 100 operates in accordance with, for example, 5G technology. Accordingly, in this example, the core network 125 comprises the following functional components:
  • NSSF Network Slice Selection Function
  • AUSF Authentication Server Function
  • AMF Access and mobility Management Function
  • SMF Session Management Function
  • PCF Policy Control function
  • the network 100 provides and manages a plurality of network slices.
  • the NSSF 130 is configured to identify and to select a suitable network slice for the UE 1 10, and then to communicate that selection in order to help ensure that the UE is registered with the selected network slice.
  • the aforementioned functional components are configured to redirect network traffic internally amongst network slices when a given network slice is temporarily unsuitable for processing a given network communication.
  • Figure 2 illustrates the components of the core network 125 that are responsible for redirecting network traffic amongst network slices.
  • NSM Network Slice Manager
  • UPF User Plane Function
  • a network slice orchestrator effects the (re-)configuration (e.g . triggered by the NSM) of the network slices 220 so as to manage the processing resources of the network slices, and therefore to fulfil the demands of services utilising the network slices.
  • an Assurance Function (AsFn) 210-2 is provided that ascertains the performance of network slices 220; that is, whether individual network slices are operating and are performing sufficiently.
  • the AsFn measures processing unit consumption; number of concurrent users (e.g. the number of UEs that are simultaneously allocated to a given network slice); and/or performance metrics (including, for example, latency, bandwidth, jitter, error rate and/or round-trip delay time).
  • the UE is allocated to, and registered with, a primary network slice 220-1 .
  • the primary network slice 220-1 is the most preferred network slice, when performing as required, for processing network communications from a given UE, and it is selected, not least, in dependence on: a prescribed selection; the type of UE; the type of network communication from the UE; time; and/or the service agreement between the mobile network operator of the core network 125 and the UE.
  • the NSM 210-1 receives from - and/or retrieves from a database 230 populated by - the AsFn 210-2 data regarding the operation and performance of the primary network slice 220-1 . If the primary network slice 220-1 is not suitable for processing a network communication from the UE, then network traffic from the UE is redirected to an alternative - partner - network slice 220-2; this occurs whilst the UE is registering with the primary network slice 220-1 and/or whilst the UE remains registered with the primary network slice 220-1 .
  • FIG. 3 outlines in more detail a process 300 by which a network communication is redirected to a partner slice.
  • a network communication from the UE 1 10 is received by the network 100.
  • the network communication is, for example, an attach request for attaching to the network.
  • the NSSF 130 identifies a primary network slice onto which to allocate the UE. Registration of the UE with the primary network slice is subsequently triggered, and registration follows 320.
  • the identified primary network slice 220-1 may not be suitable for processing a network communication from the UE. This may be for a variety of reasons, including: an existing processing capacity breach; an insufficiency of excess available processing resources to process the network communication; downtime in the network slice; scaling (out, up and/or down) of the primary network slice in order to increase processing resources of the network slice; creation or restarting of the primary network slice without it yet fully operating; removal of the primary network slice; and/or other reconfiguring of the primary network slice. Accordingly, a determination 330 is made whether the primary network slice is (or will be within an acceptable period of time, for example by the time that the UE is registered) suitable for processing the network communication from the UE 1 10; this is determined by the AsFn.
  • the primary network slice 220-1 is not operating or performing sufficiently (e.g . because it is scaling)
  • this is communicated to the NSM 210-1 ( e.g . from the AsFn, or by having the NSM access the database 230), which in step 340 triggers the NSSF to identify the partner network slice 220-2.
  • the NSSF communicates the identity of the partner network slice to the NSM, which subsequently instructs the UPF 165 internally to redirect the network communication associated with the UE 1 10 from the primary network slice to the partner network slice 350.
  • the NSM thereby prevents the primary network slice 220-1 from having to process the network communication, and the partner network slice lends its processing resources to assist the primary network slice.
  • the primary network slice is protected (for example, if it is overloaded and/or scaling) and prevents or helps reduce network congestion as experienced by the UE 100 and/or by existing UEs already registered with the primary network slice 220-1 .
  • the process then reiterates to evaluate anew whether the primary network slice is now (or now will be) suitable for processing the (ongoing) network communication 330. If so, then the NSM abolishes the redirection of the network communication and instead routes - as in the normal course of events - the network communication through the primary network slice 360.
  • partner network slice is available to change with each loop of the process 300, since a previously-identified partner network slice may no longer be suitable to process a subsequent network communication. Accordingly, a primary network slice may become a partner network slice, and vice versa, over different iterations of process 300.
  • Figure 4 is a diagram illustrating signalling between the UE and the components of the network 100 so as to perform the process 300 as show in, and as described with reference to, Figure 3.
  • the UE 100 sends a network communication to the network 100 via the RAN 120.
  • the AMF 145 receives and processes the network communication in order to establish a connection with the UE; this is performed, for example as outlined in the 3rd Generation Partnership Project (3GGP) Technical Specification 23.502, version 15.2.0, section 4.3.2.2, the contents of which are hereby incorporated by reference.
  • 3GGP 3rd Generation Partnership Project
  • the NSSF identifies the primary network slice, onto which the UE is registered. Where it is established (by the AsFn 210-2) that the primary network slice is not suitable for handling network communications from the UE, the NSM triggers the NSSF to identify the partner network slice and subsequently triggers the UPF 150 to redirect the network communication from the primary network slice to the partner network slice 420 (having been identified by the NSSF).
  • PDU Protocol Data Unit
  • the NSM triggers the UPF to cease the redirection so as to route the network communication, as normal, through the primary network slice 430.
  • the process of redirecting network communications amongst network slices is transparent to the UE; that is, the UE remains attached to the primary network slice, and so the process requires no further signalling with the UE, thereby reducing signalling overhead within the network (not least, network slice admission control signals between the RAN and the UE).
  • the effect of the redirection is to loan processing resources from one network slice to another; this can alternatively be achieved by directly reallocating processing resources between network slices (for example, as outlined in a co-pending patent application filed by this same applicant under Applicant’s reference A33738, the contents of which are hereby incorporated by reference).
  • redirection of a network communication is less complex to establish - and to revert from - than actual reallocation of processing resources between network slices.
  • the effective loaning of processing resources by redirecting a network communication as outlined above is more resource-efficient than actual reallocation of processing resources amongst network slices, since only functional resources are‘loaned’; that is, only a UPF is‘loaned’ rather than an entire network slice.
  • Figure 5 shows, in more detail, a process 500 by which the network communication from the UE is redirected to the partner network slice when the primary network slice is unsuitable because it is scaling.
  • slice scaling (up, down or out) of the primary network slice is identified (responsively or anticipatorily) 510.
  • the network 100 queries whether the UE is already connected to the primary network slice 515. If so, the UE is allowed to remain on the primary network slice (in order to help reduce disruption to the scaling primary network slice), the network further queries whether the UE is active and responsive 525. If not, and the UE is a new UE, it is registered with an alternative network slice (which may be the partner network slice, for example as outlined in a co-pending patent application filed by this same applicant under Applicant’s reference A33733, the contents of which are hereby incorporated by reference).
  • an alternative network slice which may be the partner network slice, for example as outlined in a co-pending patent application filed by this same applicant under Applicant’s reference A33733, the contents of which are hereby incorporated by reference).
  • the UE is already connected to the primary network slice, but if the UE is not active and responsive, for network efficiency, the UE is ignored 530, and query 525 is repeated to identify whether the UE subsequently becomes active (e.g . by using a UPF resource).
  • the NSSF identifies a suitable partner network slice for the UE 535, and the NSM instructs the UPF internally to redirect the network communication of the UE to the identified partner network slice 540, and the redirection is subsequently established 545.
  • Steps 510 to 545 all occur whilst the primary network slice has been triggered to scale and/or is currently scaling.
  • the network queries whether the primary network slice is suitable for handling the UE (as performed by the AsFn) 555. If not, the redirection remains until the UE is disconnected or de-registers 565 (or the UE is re-registered with an alternative network slice. If so, the NSM is informed of the suitability of the primary network slice (by the AsFn, and optionally the NSSF) and therefore triggers the UPF to terminate the redirection 565.
  • the NSSF When identifying a partner network slice, the NSSF identifies a network slice that is a most appropriate alternative to the primary network slice; that is, a network slice having the same - or a substantially similar - configuration and performance, including in relation to: latency; jitter; bandwidth; availability of processing resources; Quality of Service; Service Level Agreement; type/specialisation of network slice (e.g. Ultra-Reliable Low-Latency Communications, Mobile Broadband and enhanced, and Massive Machine Type Communications); and services available on a given network slice (e.g. Voice-over-WiFi R TM calling).
  • rules governing the selection of the partner network slice are utilised, including restrictions that the partner network slice performs no worse than the primary network slice (when it is deemed to be operating as required, for example by the AsFn).
  • the network 100 shown in, and described with reference to, Figure 1 is a mobile cellular network.
  • the aforementioned is available to be implemented as part of any network that utilises network slicing, and more generally as part of any network utilising virtualisation to segregate network resources, including fixed line, local area, and wide area networks.
  • the process of managing network resources as described above is performed by functional components of such networks that are analogous to those of the network 100.
  • the UPF 165 associated with the network slices 220 alerts the NSM 210-1 and/or the AsFn 210-2 when the first network slice is no longer suitable.
  • the identification of the partner network slice is available to be conducted at any stage in the processes described above, in particular: prior to the UE registering with the primary network slice; after the UE registers with the primary network slice; and/or once the primary network slice is deemed unsuitable for processing the network communication.
  • the partner network slice is identified for a specific primary network slice (and therefore applies to all UEs that would register with a given primary network slice). In another example, the partner network slice is identified for a specific UE (that is, on a‘per-UE’ basis).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé de gestion de trafic de réseau dans un réseau de télécommunications, le réseau de télécommunications ayant une pluralité de tranches de réseau et un équipement utilisateur (UE), l'UE étant attribué à une première tranche de réseau pour traiter une communication de réseau provenant de l'UE, le procédé comprenant les étapes consistant à : surveiller une aptitude de la première tranche de réseau à traiter la communication de réseau ; identifier une seconde tranche de réseau qui est apte à traiter la communication de réseau ; et en réponse à l'identification d'un manque d'aptitude de la première tranche de réseau à traiter la communication de réseau, rediriger la communication de réseau vers la seconde tranche de réseau tandis que l'UE reste enregistré avec la première tranche de réseau.
PCT/EP2019/072935 2018-09-27 2019-08-28 Gestion de redirection de tranches de réseau WO2020064250A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19758746.2A EP3857978B1 (fr) 2018-09-27 2019-08-28 Gestion de redirection d'une tranche de reseau
CN201980063101.4A CN112771931B (zh) 2018-09-27 2019-08-28 管理电信网络中的网络业务的方法和管理网络业务的电信网络
US17/280,312 US20220038953A1 (en) 2018-09-27 2019-08-28 Network slice management

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18197315 2018-09-27
EP18197315.7 2018-09-27

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CN112771931A (zh) 2021-05-07

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